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Diodes Semiconductor Electronic Components Datasheet

AP3407A Datasheet

1.4MHz High Efficiency Synchronous DC-DC Buck Converter

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AP3407A pdf
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
General Description
The AP3407/A is a 1.4MHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 1.2A load with high
efficiency, excellent line and load regulation. The
device integrates synchronous P-channel and
N-channel power MOSFET switches with low
on-resistance. It is ideal for powering portable
equipment that runs from a single Li-ion battery.
A standard series of inductors are available from
several different manufacturers optimized for use
with the AP3407/A. This feature greatly simplifies
the design of switch-mode power supplies.
The AP3407/A is available in SOT-23-5.
Features
Input Voltage Range: 2.5V to 5.5V
Output Voltage: 0.6V to VIN
• ADJ Output
• Fixed 1.4MHz Frequency
• High Efficiency up to 95%
• Output Current: 1.2A
Current Mode Control
100% Duty Cycle in Dropout
Built-in Over Current Protection
Built-in Short Circuit Protection
Built-in Thermal Shutdown Protection
• Built-in UVLO Function
Built-in Soft-start
Applications
• Datacom
• Portable Device
Smart Phone
Dec. 2011 Rev. 1. 3
SOT-23-5
Figure 1. Package Type of AP3407/A
BCD Semiconductor Manufacturing Limited
1


Diodes Semiconductor Electronic Components Datasheet

AP3407A Datasheet

1.4MHz High Efficiency Synchronous DC-DC Buck Converter

No Preview Available !

AP3407A pdf
Data Sheet
1.2A, 1.4MHz High Efficiency Synchronous DC-DC Buck Converter AP3407/A
Pin Configuration
K Package
(SOT-23-5)
EN 1
GND 2
SW 3
5 FB
4 VIN
VIN 1
GND 2
EN 3
5 SW
4 FB
(For AP3407)
(For AP3407A)
Figure 2. Pin Configuration of AP3407/A (Top View)
Pin Description
Pin Number
AP3407
AP3407A
13
22
35
41
54
Pin Name
EN
GND
SW
VIN
FB
Function
Control input pin. Forcing this pin above 1.5V enables
the IC. Forcing this pin below 0.4V shuts down the IC.
When the IC is in shutdown mode, all functions are
disabled to decrease the supply current below 1.2A
Ground pin
Power switch output pin. Inductor connection to drain
of the internal PFET and NFET switches
Supply input pin. Bypass to GND with a 4.7µF or
greater ceramic capacitor
This is the feedback pin of the device. Connect this pin
directly to the output if the fixed output voltage version
is used. For the adjustable version an external resistor
divider is connected to this pin.
Dec. 2011 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
2


Part Number AP3407A
Description 1.4MHz High Efficiency Synchronous DC-DC Buck Converter
Maker BCD Semiconductor
Total Page 11 Pages
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